All 4 Uses

perpetual
in
And The Mountains Echoed
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It was as though it—God forgive me for this blasphemy—had descended down on me from Heaven itself, the garden of the righteous, as the book says, where rivers flow beneath, and perpetual are the fruits and the shade therein.†
Chpt 4 *
He had a frozen, wide-eyed look to his face, I remember, the way some old people do, like they are perpetually startled by the monstrous surprise that is old age—it wasn't until years later, in medical school, that I suspected he had Parkinson's.†
Chpt 8
The brightness in her eyes, this new hearty laugh, the perpetual flush of the cheeks—the overall impression is, a farmer's wife.†
Chpt 8
Since the stroke, his face has become a mask, his mouth frozen perpetually in a lopsided, polite little smile that never climbs to his eyes.†
Chpt 9

Definitions:

(1) (perpetual)
continuing forever without change; or occurring so frequently it seems constant
(2) (meaning too rare to warrant focus)